William Johnston, MD
NPI 1265456206 · Family Medicine Physician · Vicksburg, MS
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Johnston, MD is a Family Medicine Physician provider in Vicksburg, MS (NPI 1265456206).
Provider details
- NPI number
- 1265456206
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 19317 (MS)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
402 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 177 | $116 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 152 | $168 |
| Critical Care, First 30-74 Minutes99291 | 37 | $198 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 36 | $8 |
Typical Medicare-allowed amounts for these services range $8–$198 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 86 | 84 |
| Pantoprazole Sodium | 33 | 32 |
| Nabumetone | 32 | 32 |
| Ondansetronbrand: Ondansetron Odt | 30 | 29 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 29 | 28 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 26 | 26 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-26
- Last updated
- 2019-12-06
Frequently asked questions
- What is William Johnston's NPI number?
- William Johnston's National Provider Identifier (NPI) is 1265456206, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Johnston's specialty?
- William Johnston is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Johnston located?
- William Johnston's practice location on file with NPPES is 1901 Mission 66, Vicksburg, MS 39180-3711.
- What is William Johnston's phone number?
- The practice phone number listed in the NPPES registry for William Johnston is (601) 636-0097.
- Does William Johnston accept Medicare?
- William Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Johnston's NPI active?
- Yes — William Johnston's NPI (1265456206) is active in the NPPES registry as of the last update on 2019-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.